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Proceedings Paper

Enhancement of laser cooling efficiency in rare-earth-doped oxide at elevated high temperature
Author(s): Yuta Nakayama; Yukihiro Harada; Takashi Kita
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Paper Abstract

We demonstrated an enhancement of the ideal laser-cooling efficiency in Yb-doped yttrium aluminum garnet, (Yb:Y)AG, and Er-doped yttrium aluminum garnet, (Er:Y)AG, ceramic discs above 300 K. The temperature-dependent photoluminescence (PL) spectrum indicates that the phonon-assisted energy transfer from the narrowband, resonant state into the inhomogeneously distributed energy states is enhanced with increasing the temperature. The enhanced ideal cooling efficiency of the (Yb:Y)AG ceramic disc and the (Er:Y)AG ceramic disc at 470 K is 1.7 times higher than that at 300 K. The enhanced ideal cooling efficiency of (Er:Y)AG at 470 K marked 4.0% which is 1.8 times higher than that of (Yb:Y)AG.

Paper Details

Date Published: 24 February 2020
PDF: 10 pages
Proc. SPIE 11298, Photonic Heat Engines: Science and Applications II, 112980B (24 February 2020); doi: 10.1117/12.2545460
Show Author Affiliations
Yuta Nakayama, Kobe Univ. (Japan)
Yukihiro Harada, Kobe Univ. (Japan)
Takashi Kita, Kobe Univ. (Japan)

Published in SPIE Proceedings Vol. 11298:
Photonic Heat Engines: Science and Applications II
Denis V. Seletskiy; Richard I. Epstein; Mansoor Sheik-Bahae, Editor(s)

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